linux-kernel - Re: [PATCH v2] h8300/kernel/setup.c: add "linux/initrd.h" to pass compiling

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Date:	Fri, 30 Aug 2013 13:49:55 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2]  h8300/kernel/setup.c: add "linux/initrd.h" to pass
 compiling

On 08/30/2013 12:32 PM, Guenter Roeck wrote:
> On 08/29/2013 08:59 PM, Chen Gang wrote:
>> The related error (allmodconfig for h8300):
>>
>>    arch/h8300/kernel/setup.c: In function 'setup_arch':
>>    arch/h8300/kernel/setup.c:103:3: error: 'initrd_start' undeclared
>> (first use in this function)
>>       initrd_start = memory_start;
>>       ^
>>    arch/h8300/kernel/setup.c:103:3: note: each undeclared identifier
>> is reported only once for each function it appears in
>>    arch/h8300/kernel/setup.c:104:3: error: 'initrd_end' undeclared
>> (first use in this function)
>>       initrd_end = memory_start += be32_to_cpu(((unsigned long *)
>> (memory_start))[2]);
>>       ^
>>
>> Signed-off-by: Chen Gang <gang.chen@...anux.com>
>> ---
>>   arch/h8300/kernel/setup.c |    4 ++++
>>   1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
>> index d0b1607..85639a1 100644
>> --- a/arch/h8300/kernel/setup.c
>> +++ b/arch/h8300/kernel/setup.c
>> @@ -47,6 +47,10 @@
>>   #include <asm/regs267x.h>
>>   #endif
>>
>> +#if defined(CONFIG_BLK_DEV_INITRD)
>> +#include <linux/initrd.h>
>> +#endif
>> +
> 
> Is the #ifdef/#endif really needed ? If not you should drop it.
> 

"linux/initrd.h" is needed by 'initrd_start' and 'initrd_end' when
BLK_DEV_INITRD enabled.

'memory_start' is defined within this file, and also only one place may
use "linux/initrd.h" within this file.

So if BLK_DEV_INITRD disabled, do not need "linux/initrd.h" either.


Please reference the code in "arch/h8300/kernel/setup.c" below.

102 void __init setup_arch(char **cmdline_p)
103 {
104         int bootmap_size;
105 
106         memory_start = (unsigned long) &_ramstart;
107 
108         /* allow for ROMFS on the end of the kernel */
109         if (memcmp((void *)memory_start, "-rom1fs-", 8) == 0) {
110 #if defined(CONFIG_BLK_DEV_INITRD)
111                 initrd_start = memory_start;
112                 initrd_end = memory_start += be32_to_cpu(((unsigned long *) (memory_start))[2]);
113 #else
114                 memory_start += be32_to_cpu(((unsigned long *) memory_start)[2]);
115 #endif
116         }



> Thanks,
> Guenter
> 
> 
> 

Thanks.
-- 
Chen Gang
--
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